Composite filter media

US5800586A · kind A · utility

Assignee

• Johns Manville International Inc. · US

Inventors

• Michael J. Cusick · Suffern, US
• Fred L. Jackson · Littleton, US
• Charles Francis Kern · Cambridge, US
• Craig D. DePorter · Denver, US

Key dates

• Filing date: Nov 8, 1996
• Grant date: Sep 1, 1998
• Expiry date: Nov 8, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24711
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A composite filter media includes a fibrous filtration layer of randomly oriented fibers and one or more pleatable stiffening layers which enable the composite filter media to be pleated and hold or retain its pleats. The pleatable stiffening layer(s) may enhance the dirt holding capacity of the composite filter media especially when positioned upstream of the fibrous filtration layer. The composite filter media may also include a flexible covering layer which functions to block the loss of fibers from the fibrous filtration layer. Preferably, the mean fiber diameter of the fibers in fibrous filtration layer increases and the density of the fibrous filtration layer decreases throughout the thickness of the fibrous filtration layer from one major surface to the other major surface of the fibrous filtration layer.